We are sad to relay news of the death of R. Darrell Bock. Darrell was a titan in the field – his work defined the shape and trajectory of modern psychometrics. We each had the pleasure of meeting Darrell at various points in our careers and he was as impressive in person as he was in his published work. All three of us – indeed this entire company – have been shaped by Darrell’s many contributions. We echo the closing … Read More
All posts by Li Cai
VPG Awarded FDA Grant to Develop Clinical Outcome Assessments for Migraine
As part of our Patient Focused Drug Development (PFDD) efforts, the U.S. Food and Drug Administration (FDA) developed a pilot grant program to support the development of publicly available core set(s) of Clinical Outcome Assessments (COAs) and their related endpoints for specific disease indications (RFA-FD-19-006). On September 11, 2019 the FDA made three awards under this grant program. These awards will provide avenues to advance the use of patient input as an important part of drug development that can foster innovation and … Read More
Measurement invariance, the lack thereof, and modeling change
Edwards, M.C, Houts, C.R., & Wirth, R.J. (In Press). Measurement invariance, the lack thereof, and modeling change. Quality of Life Research.
VPG’s Dr. Cai joins GRE Board Research Commitee
Dr. Li Cai will serve on the GRE Board Research Committee for the next three years.
Individual Differences in the Relation of Migraine and Menstruation: Examining the ICHD-3beta Time Window
James S. McGinley, R. J. Wirth, Gabriel Boucher, Dawn C. Buse, Stephen Donoghue, Jelena Pavlovic, Richard B. Lipton, Anne MacGregor (2017). Individual Differences in the Relation of Migraine and Menstruation: Examining the ICHD-3beta Time Window. Poster (EP-02-022) to be presented at the 18th Congress of the International Headache Society in Vancouver, Canada.
Fit for purpose and modern validity theory in clinical outcomes assessment
Edwards, M.C., Slagle, A., Rubright, J.D., & Wirth, R.J. (in press). Fit for purpose and modern validity theory in clinical outcomes assessment. Quality of Life Research. Special Section: Test Construction (By Invitation Only). http://rdcu.be/t1f0
Redefining the Time Window of Perimenstrual Migraine Days Reveals Additional Inter- and Intra-Individual Differences
James S. McGinley, R. J. Wirth, Gabriel Boucher, Dawn C. Buse, Stephen Donoghue, Jelena Pavlovic, Anne MacGregor, Richard B. Lipton (2017). Redefining the Time Window of Perimenstrual Migraine Days Reveals Additional Inter- and Intra-Individual Differences. Poster (PO-02-057) to be presented at the 18th Congress of the International Headache Society in Vancouver, Canada.
Longitudinal IRT for scale development with small samples
VPG’s Drs. Wirth and Houts presentation will be held on Thursday, October 29, 2017 from 1:45 to 3:15PM at the 24th Annual ISOQOL Conference in Philadelphia, PA.
Longitudinal modeling of item response data: A comparison of two approaches
VPG’s Drs. McGinley and Houts presentation will be held on Thursday, October 29, 2017 from 1:45 to 3:15PM at the 24th Annual ISOQOL Conference in Philadelphia, PA.
Testing an Evidence-based Theoretical Model of Imminent (1-year) Fracture Risk in Elderly Women: Results from the Canadian Multicentre Osteoporosis Study (CaMOS)
VPG, in collaboration with Amgen and CaMos, will be presenting a poster entitled: Testing an Evidence-based Theoretical Model of Imminent (1-year) Fracture Risk in Elderly Women: Results from the Canadian Multicentre Osteoporosis Study (CaMOS) at the ASBMR 2017 Annual Meeting, September 8-11, 2017 at the Colorado Convention Center in Denver, Colorado.